I won't have the ability to check this for about a week. What numbers should I be looking for?

Ground wires should always be as close to zero Ohms as possible and by 'possible', it means that if it's not zero Ohms, it needs to be repaired so it is. This isn't optional, it's necessary for the proper operation of whatever is using the ground. New accessories should NEVER be added to a power or ground wire that's being used for something else, unless they were sized for additional accessories, but only up to the limit of those wires for the purpose of conducting current. As soon as a device draws more current when conducted by a wire, the voltage drops and that's where problems begin.